Scotsman MCS 46 A User manual

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Page 1
Scotsman Ice Srl
Via Lainate, 31 - 20010 Pogliano M.se - Milano - Italy
Tel. [phone] (Aut. Sel.)- Telefax [phone]
Direct Line to Service & Parts:
Phone [phone] - Fax [phone]
Website: www.scotsman-ice.it
E-Mail: [email protected]
ISO 9001 - Cert. n. 0080
MC 46
Electronic
modular cubers
New PC Board
From s.n. 28850
REV. 09/2015
SERVICE MANUAL

LED STATUS REASON WHY - SIGNIFICATION - SIGNIFICATO
ON STEADY
FIXE
FISSO
FREEZING CYCLE
EN RÉFRIGÉRATION
IN CONGELAMENTO
BLINKING
CLIGNOTANT
LAMPEGGIANTE
60 MINUTES DELAY AT START UP JUMPER J3 OUT
60 MINUTES DE RETARD AU DEMARRAGE - CAVALIER J3 OUVERTE
60 MINUTI RITARDO PARTENZA - CONTATTI J3 APERTI
ON STEADY
FIXE
FISSO
TOO HI DISCHARGE PRESSURE/TEMP.
COUPURE HP
FERMATAALTA TEMP. CONDENSAZIONE
BLINKING
CLIGNOTANT
LAMPEGGIANTE
TOO HI EVAP. TEMP. (> 0°C) AFTER 15’ FROM START UP
COUPURE BP (>0°C LU PAR LA SONDE EVAP. NON ATTEINTE APRES 15’ FONCT.)
TEMP. EVAP. > 0°C DOPO 15’ DA INIZIO CONGELAMENTO
ON STEADY
FIXE
FISSO
UNIT OFF AT BIN FULL
CABINE PLEINE
CONTENITORE PIENO
BLINKING SLOW
CLIGNOTANT LENT
LAMPEGG. LENTO
I/R BEAM CUTTED
FAISCEAU INFRA ROUGE CELLULE NIVEAU GLACE INTERROMPU
RAGGIO INFRAROSSO INTERROTTO
BLINKING FAST
CLIGNOTANT RAPIDE
LAMPEGG. VELOCE
I/R ON AFTER TRIP OFF AT BIN FULL
FAISCEAU INFRA ROUGE CELLULE NIVEAU GLACE ETABLI
RAGGIO INFRAROSSO RIPRISTINATO DOPO FERMATAA CONT. PIENO
ON STEADY
FIXE
FISSO
I/R CALIBRATION DONE
CALIBRATION FAISCEAU INFRAROUGE CELL. NIVEAU GLACE REALISÉ
CALIBRAZIONE RAGGIO INFRAROSSO EFFETTUATA
BLINKING
CLIGNOTANT
LAMPEGGIANTE
UNIT IN CLEANING MODE OR TRIPPING OFF AFTER TEST - JUMPER TEST IN
MACHINE EN MODE DETARTRAGE OU ARRÊTE APRES LE TEST - CAVALIER TEST FERMÉ
MACCHINA NELLA FASE LAVAGGIO O FERMA DOPO ILTEST - PONTICELLO TEST CHIUSO
ON STEADY
FIXE
FISSO
CONDENSER SENSOR OUT OF ORDER
SONDE CONDENSEUR HS
SONDA CONDENSATORE MALFUNZIONANTE
BLINKING
CLIGNOTANT
LAMPEGGIANTE
EVAPORATOR SENSOR OUT OF ORDER
SONDE EVAPORATEURS HS
SONDA EVAPORATORE MALFUNZIONANTE
BLINKING ALTERNATIV.
CLIGNOTANT ALTERNÉ
LAMPEGGIO ALTERN.
I/R SENSOR OUT OF ORDER
SONDE INFRA ROUGE CELLULE NIVEAU GLACE HS
SONDAALL’INFRAROSSO LIVELLO GHIACCIO MALFUNZIONANTE
PUSH
PUSH > 5” DURING WATER FILLING TO MOVE THE UNIT INTO FREEZING
PUSH > 5” DURING FREEZING TO MOVE THE UNIT INTO DEFROST
PUSH > 5” DURING DEFROST TO MOVE THE UNIT INTO FREEZING
PUSH 2” ÷5” DURING WATER FILLING TO MOVE THE UNIT INTO CLEANING
PUSH DURING THE 60 MIN START UP DELAY TIME TO BY-PASS IT
START
AMPS
MC 16 SHORT A - 230 V
MC 16 SHORT W - 230 V
MC 16 SHORT A - 400 V
MC 16 SHORT W - 400 V
MC 46 A - 230 V
MC 46 W - 230 V
MC 46 A - 400 V
MC 46 W - 400 V
MC 1210 A - 400 V
MC 1210 W - 400 V
AMPS WATTS KWH/24HRS REFR. CHARGE
R404a SUCT. PRESS. END. FREEZE DISCHARGE PRESSURE
7,1
3
10
5,5
11
32
18
66
14
28
1300
1400
2400
4800
580 gr
450 gr
580 gr
450 gr
1300 gr
700 gr
1300 gr
700 gr
2 x 1300 gr
2 x 700 gr
1,6 ÷1,7 bar
1,6 ÷1,7 bar
2,5 bar
16 ÷18 bar
17 bar
16 ÷18 bar
17 bar
16 ÷18 bar
17 bar
16 ÷18 bar
17 bar
13 ÷14 bar
13,5 ÷14,5 bar
14 bar
1 2 3 4
MCS 16 A
MCS 16 W
MCM 16 A
MCM 16 W
MCL 16 A
MCL 16 W
MCS 46 A
MCS 46 W
MCM 46-1210 A
MCM 46-1210 W
MCL 46-1210 A
MCL 46-1210 W
MCXL 46 W
5 6 7 8 9 10
ON
ON
OFF
OFF
OFF
OFF
ON
ON
ON
OFF
ON
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
ON
ON
ON
ON
ON
ON
OFF
OFF
ON
ON
OFF
OFF
ON
ON
OFF
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
ON
ON
ON
OFF
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
OFF
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
OFF
DIP SWITCH FACTORY SETTING COMBINATIONS (PER MODEL AND VERSION)
COMBINAISON DES COMMUTATEURS NUMERIQUES DU DIP SWITCH POUR MODELES ET VERSIONS
REGOLAZIONE TASTI DIP SWITCH PER MODELLO E VERSIONE
DIP SWITCH
FREEZING CYCLE
CYCLE DE CONGÉLATION
CICLO CONGELAMENTO
DEFROST CYCLE
CYCLE DE DÉMOULAGE
CICLO SBRINAMENTO
15/30"
1 2 3 4
ON ON ON ON 1 min.
OFF ON ON ON 3 min.
ON OFF ON ON 5 min.
OFF OFF ON ON 7 min.
ON ON OFF ON 9 min.
OFF ON OFF ON 11 min.
ON OFF OFF ON 13 min.
OFF OFF OFF ON 15 min.
ON ON ON OFF 17 min.
OFF ON ON OFF 19 min.
ON OFF ON OFF 21 min.
OFF OFF ON OFF 23 min.
ON ON OFF OFF 25 min.
TIMED PORTION FREEZING CYCLE
TEMPS PHASE TEMPORISÉE CONGELATION
TEMPI FASE TEMPORIZZATA CONGELAMENTO
7 8
OFF OFF
WATER PUMP OFF DURING DEFROST
POMPE A L’ARRÊT PEND. DEGIVRAGE
POMPAACQUA DURANTE SBRINAMENTO
7 8
ON ON 0
OFF ON 30 sec.
ON OFF 60 sec.
ADDITIONAL DEFROST TIME
TEMPS AJOUTÉS
TEMPI AGG. SCONGELAMENTO
AIR/EAU
ARIA/ACQUA
27,6
28,0
50
105

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Page 2
TABLE OF
CONTENTS Table of contents
Specifications MC 46
GENERAL INFORMATION AND INSTALLATION
Introduction
Unpacking and Inspection - Ice maker
Unpacking and Inspection - Storage bin
Location and levelling
Stacking installation
Electrical connections
Water supply and drain connections
Final check list
Installation practice
OPERATING INSTRUCTIONS
Start up
Operatiobnal checks
OPERATING PRINCIPLES (How it works)
Freezing cycle
Harvest cycle
Control sequence
Component description
ADJUSTMENT, REMOVAL AND REPLACEMENT PROCEDURES
Adjustment of the cube size
Wiring diagram
Service diagnosis
MAINTENANCE AND CLEANING INSTRUCTIONS
General
Icemaker
Cleaning instructions of water system
2
3
15
17
18
19
24
25-26-27
28
30
30
31
10
11
5
5
5
5
6
8
8
8
9

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310
300
290
280
270
260
250
240
230
220
210
200
190
180
Kg.
32 10 °C27 21 15
MODÈLES REFROIDIS PAR AIR
TEMPÉRATURE DE L'EAU
TEMPÉRATURE AMBIANTE
PRODUCTION DE GLACE EN 24 H
32
38
10
21
°C
MODÈLES REFROIDIS PAR EAU
310
300
290
280
270
260
250
240
230
220
210
200
190
180
Kg.
32 10 °C27 21 15
TEMPÉRATURE DE L'EAU
TEMPÉRATURE AMBIANTE
PRODUCTION DE GLACE EN 24 H
10
21
32
38
°C
ice making capacity
AIR COOLED MODELS
AMBIENT TEMPERATURE
WATER TEMPERATURE
ICE PRODUCED PER 24 HRS
AMBIENT TEMPERATURE
WATER TEMPERATURE
ICE PRODUCED PER 24 HRS
WATER COOLED MODELS
SPECIFICATIONS
ELECTRONIC CUBER MODEL MC 46
I mportant operating requirements:
MIN.
Air temperature 10°C (50°F)
Water temperature 5°C (40°C)
Water pressure 1 bar (14 psi)
Electr. voltage variations
from voltage rating
specified on nameplate -10%
MAX.
40°C (100°F)
35°C (90°F)
5 bars (70 psi)
+10%
NOTE.Thedailyice-makingcapacityisdirectlyrelatedtothecondenserairinlettemperature,water
temperature and age of the machine.
Tokeep your SCOTSMAN MODULAR CUBER at peak performancelevels, periodic maintenance
checks must be carried out as indicated on maintenance section of this manual.
Production charts shown are indicating the production of MCM and MCL models. For MCS models
ice production is approx. 10% lower.

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Page 4
MC 46 AS 6 Air Stainless steel
MC 46 WS 6 Water Stainless steel 2.5
Model Cond. unit Finish Comp. HP Water req. - lt/24 HR
SPECIFICATIONS
660
3700*
MC 46 - MACHINE SPECIFICATIONS
DIMENSIONS:
HEIGHT 874 mm.
WIDTH 1074 mm.
DEPTH 534 mm.
WEIGHT 185 Kgs.
ACCESSORIES
KSC 11: Cube stacking kit
220-230/50/1 7 2400 50 3 x
Basic electr. Amps Watts N. of wires Amps. fuse
230/50/1N10 66 3 x 1.5 m/m220
400/50/3N5.5 14 5 x 1.5 m/m210
Starts Electric power cons.
amps. Kwh x 24 HR
Cubes per harvest: MCL-46 144 large - MCM-46 204 medium - MCS 46 396 small
* At 15°C (60°F) water temperature

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Page 5
A. INTRODUCTION
This manual provides the specifications and the
step-by-stepproceduresfortheinstallation,start-
up and operation, maintenance and cleaning for
the SCOTSMAN MODULAR CUBERS.
The Electronic Modular Cubers are quality
designed, engineered and manufactured.
Their ice making systems are thoroughly tested
providing the utmost in flexibility to fit the needs
of a particular user.
These icemakers have been engineered to our
own rigid safety and performence standards.
NOTE.Toretainthesafetyandperformance
built into this icemaker, it is important that
installation and maintenance be conducted
in the manner outlined in this manual.
Storage Bin
Since the MC series Modular Cubers do not
have their own attached ice storage bins, it is
necessarytouseanauxiliarybin suchastheBin
SB 550.
B. UNPACKING AND INSPECTION
Modular Cuber
1. CallyourauthorizedSCOTSMANDistributor
or Dealer for proper installation.
2. Visually inspect the exterior of the packing
and skid. Any severe damage noted should be
reportedtothedeliveringcarrierandaconcealed
damage claim form filled in subjet to inspection
of the contents with the carrier’s representative
present.
3. a)Cutandremovetheplasticstripsecuring
the carton box to the skid.
b) Remove the packing nails securing the
carton box to the skid.
c)Cutopenthetopofthecartonandremove
the polystyre protection sheet.
d) Pull out the polystyre posts from the
corners and then remove the carton.
4. Remove top and sides panels of the unit
and inspect for any concealed damage. Notify
carrier of your claim for the concealed damage
as stated in step 2 above.
5. Loosetwonutson left andrightssideofthe
unit base and remove it from the skid. Save the
two bolts and nuts to mount the machine on
storage bin or on top of another Modular Cuber.
GENERAL INFORMATION AND INSTALLATION
6. Remove all internal support packing and
masking tape and the hardware package.
7. Check that refrigerant lines do not rub
againstortouchother lines orsurfaces,andthat
the fan blade moveS freely.
8. Checkthatthe compressor fits snugly onto
all its mounting pads.
9. See data plate on the rear side of the unit
and check that local main voltage corresponds
with the voltage specified on it.
CAUTION. Incorrect voltage supplied to
the icemaker will void your parts
replacement program.
10. Remove the manufacturer’s registration
card from the inside of the User Manual and fill-
in all parts including: Model and Serial Number
taken from the data plate.
Forward the completed self-addressed
registration card to Frimont/Scotsman Europe
factory.
C. LOCATION AND LEVELLING
WARNING. This Ice Cuber is designed
for indoor installation only. Extended
periods of operation at temperature
exceedingthefollowinglimitations will
constitute misuse under the terms of
theSCOTSMANManufacturer’sLimited
WarrantyresultinginLOSS of warranty
coverage.
1. Position the Bin in the selected permanent
location.Criteriaforselectionoflocationinclude:
a)Minimumroomtemperature10°C(50°F)
and maximum room temperature 40°C (100°F).
b) Water inlet temperatures: minimum 5°C
(40°F) and maximum 35°C (90°F).
c) Well ventilated location for air cooled
models.
d) Service access: adequate space must
be left for all service connections through the
rearoftheicemaker.Aminimumclearanceof15
cm (6") must be left at the sides of the unit for
routingcoolingairdrawnintoandexhausted out
of the compartment to maintain proper
condensing operation of air cooled models.

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Page 6
2. Level the Storage Bin Assy in both the left
to right and front to rear directions by means of
the adjustable legs.
3. InspecttheStorageBintopmountinggasket
which should be flat with no wrinkles, to provide
a good sealing when the Modular Cuber is
installed on top of it.
4. Place the Modular Cuber on top of
Storage bin using care not to wrinkle or tear
the gasket.
5. LiftalittlebittheModularCuberrightsidein
order to be able to mount the ice level control
bracket taking care to align the hole located on
unit base to mate with the one on the top of the
Bin.
6. Remove the PVC plastic plug closing the
round hole located on the right side of the ice
chute opening.
7. Tracetheicelevelcontrolassy,securedfor
the transport on top of the evaporator of the
Modular Cuber, and direct it down through the
round hole into the Storage Bin.
8. Fasten the ice level control assy on its
bracket by means of the two screws found in the
hardware package supplied with the unit.
9. Make a cut (shear) in the PVC plastic plug
that goes from its edge to the center; insert the
ice level control cable in the center of the plastic
plugso to prevent it from anysort of contact with
the unit frame, then place again the PVC plug in
the round hole keeping the cable exceeding
portion inside the unit.
10. Install the plastic ice cube deflector by
hooking it on the flange of the ice chute opening
in unit base (see illustration).
11. SecuretheModularCuberonthetopof the
StorageBinusingthetwoboltsanddiberwasher
foundinthehardwarepackagesuppliedwiththe
unit.
D. STACKING INSTALLATION
AStackingKitKSC11isavailableasanaccessory
onrequesttoallowtheinstallationoftwoModular
Cubers one on top of the other.
The Stacking Kit is consisting of:
a) unit base gasket
b) plastic reinforced ice chute
connections
Use the ice chute connections supplied in the
KSC Kits..........
...toconnecttheicechuteofthebottommachine
with the one of the top machine

Page 7
Page 7

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Page 8
E. ELECTRICAL CONNECTIONS
See data plate for current requirements to
determine wire size to be used for electrical
connections.AllSCOTSMAN icemakersrequire
a solid earth wire.
All SCOTSMAN ice machines are supplied from
thefactorycompletelypre-wiredandrequireonly
electrical power connections to the wire cord
provided at the rear of the unit.
Make sure that the ice machine is connected to
its own circuit and individually fused (see data
plate for fuse size).
Themaximumallowablevoltagevariationshould
not exceed -10% and +10% of the data plate
rating. Low voltage can cause faulty functioning
and may be responsible for serious damage to
the overload switch and motor windings.
NOTE. All external wiring should conform to
national, state and local standards and
regulations.
Check voltage on the line and the ice maker’s
data plate before connecting the unit.
F. WATER SUPPLY AND DRAIN
CONNECTIONS
General
Whenchoosingthewatersupplyfortheiceflaker
consideration should be given to:
a) Length of run
b) Water clarity and purity
c) Adequate water supply pressure
Sincewateristhemostimportantsingleingredient
in producting ice you cannot emphasize too
much the three items listed above.
Low water pressure, below 1 bar may cause
malfunction of the ice maker unit.
Watercontaining excessive minerals will tendto
produce cloudy coloured ice cubes, plus scale
build-up on parts of the water system.
Water supply
Connectthe3/4"GASmale fittingofthesolenoid
water inlet valve, using flexible tubing or a 3/8"
O.D. copper pipe, to the cold water supply line
with regular plumbing fitting and a shut-off valve
installed in an accessible position between the
water supply line and the unit.
Water supply - Water cooled models
The water cooled versions of SCOTSMAN Ice
Makersrequiretwoseparateinletwatersupplies,
one for the water sprayed for making the ice
cubes and the other for the water cooled
condenser.
Connect the 3/4" GAS male fitting of the water
inlet, using the flexible tubing or a 3/8" O.D.
copper pipe, to the cold water supply line with
regular plumbing fitting and a shut-off valve
installed in an accessible position between the
water supply line and the unit.
Water drain
The recommended drain tube is a plastic or
flexible tube with 18 mm (3/4") I.D. which runs to
an open trapped and vented drain. When the
drain is a long run, allow 3 cm pitch per meter
(1/4" pitch per foot).
Aventattheunitdrainconnectionisalsorequired
for proper sump drainage.
Water drain - Water cooled models
Connect the 3/4" GAS male fitting of the
condenserwaterdrain,utilizingasecondflexible
tubing or a 3/8" O.D. copper tubing, to the open
trapped and vented drain.
NOTE.Thewatersupplyandthewaterdrain
must be installed to conform with the local
code. In some case a licensed plumber and/
or a plumbing permit is required.
G. FINAL CHECK LIST
1. Is the unit in a room where ambient
temperatures are within a minimum of 10°C
(50°F) even in winter months?
2. Is there at least a 15 cm (6") clearance
around the unit for proper air circulation?
3. Is the unit level? (IMPORTANT)
4. Have all the electrical and plumbing
connectionsbeenmade,and is thewatersupply
shut-off valve open?
5. Has the voltage been tested and checked
against the data plate rating?
6. Has the water supply pressure been
checked to ensure a water pressure of at least 1
bar (14 psi).
7. Havetheboltsholdingthecompressordown
been checked to ensure that the compressor is
snugly fitted onto the mounting pads?
8. Checkallrefrigerantlines andconduitlines
to guard against vibrations and possible failure.
9. Have the bin liner and cabinet been wiped
clean?
10. Has the owner/user been given the User
Manualandbeeninstructedontheimportanceof
periodic maintenance checks?
11. Has the Manufacturer’s registration card
been filled in properly? Check for correct model
and serial number against the serial plate and
mail the registration card to the factory.

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Page 9
H. INSTALLATION PRACTICE
1. Hand shut-off valve
2. Water filter
3. Water supply line (flexible hose)
4. 3/4" gas male fitting
5. Power line
6. Main switch
7/9. Drain fitting
8/10. Vented drain line
11. Open trapped vented drain
WARNING. This icemaker is not designed for outdoor installation and will not function in
ambient temperatures below 10°C (50°F) or above 40°C (100°F).
This icemaker will malfunction with water temperatures below 5°C (40°F) or above 35°C
(90°F).

Page 10
Page 10
OPERATING INSTRUCTIONS
NOTE. Ice maker pcb is equippedby jumper
cleaning reminding setting (see pag. 20)
suitabletoalertusersaftercertaintimeofunit
operation. This would advice for preventive
maintenance.
This time can be adjusted for 6 or 12 months
operation (upon installer advice related to
installationsitewaterandambientcondition);
onceselectedtimeiselapsedREDfrontpanel
lampblinksslowlyand ice maker will keep on
working anyway.
Pcb is also equipped by 3 (standard) or 60
(machines operating at 400/50/3) minutes
jumpersettingstart updelay(seepag.20).
Incaseofpcbsettingto60minutesicemaker
doesn't start until this time is elapsed. After
having correctly installed the ice maker and
completed the plumbing and electrical
connections, perform the following “Start-up”
procedure.
START UP
Afterhavingcorrectlyinstalledtheicemakerand
completed the plumbing and electrical
connections,performthefollowing“Start-up”pro-
cedure.
A. Give power to the unit to start it up by
switching "ON" the power line main disconnect
switch.
NOTE. Every time the unit returns under
power, after having been switched off, the
water inlet valve, the hot gas valve and the
water drain valve get energized for a period
of 5 minutes, thus to admit new water to the
machine sump reservoir to fill it up and,
eventually,towash-offanydirtthatcanhave
deposited in it during the unit off period
(Fig.1).
B. During the water filling operation, check to
seethattheincomingwaterdribbles,throughthe
evaporator platen dribbler holes, down into the
sump reservoir to fill it up and also that the
incoming surplus of water flows out through the
overflow pipe into the drain line.
During the water filling phase the components
energized are:
THE WATER INLET SOLENOID VALVE
THE HOT GAS SOLENOID VALVE
THE WATER DRAIN SOLENOID VALVE/S
for the first 30 seconds.
16
15
14
13
2
1
7
8
9
10
3
4
5
6
11
12
Rx Tx
WATER IN VALVE
HOT GAS VALVE
CONTACTOR COIL
FAN MOTOR
WATER PUMP
- EVAPORATOR
- AMBIENT
- CONDENSER
TEMPERATURE SENSORSBINCOMPRESSOR
TRANSF.
DATA
PROCESSOR
ELECTR.
TIMER
DIP
SWITCH
ELECTRONIC CARD
L
N
RELAYS
RELAY
TRIAC
WATER DRAIN VALVE
FIG. 1

Page 11
Page 11
NOTE . If in the 5 minutes length of the water
filling phase the machine sump reservoir
does not get filled with water up to the rim of
the overflow pipe, it is advisable to check:
1.Thewaterpressureofthewatersupplyline
thatmustbeatleast1bar(14psig)Minimum
(Max 5 bar-70 psig).
2.The filtering device installed in the water
linethatmayreducethewaterpressurebelow
the Minimum value of 1 bar (14 psig).
3. Any clogging situation in the water circuit
like the inlet water strainer and/or the flow
control.
C. At completion of the water filling phase(5
minutes) the unit passes automatically into the
freezing cycle with the start up of:
COMPRESSOR
WATER PUMP
FANMOTOR/S(in air cooledversion)controlled
by the condensing temperature sensor located
within the condenser fins (Fig.2).
OPERATIONAL CHECKS
D. If necessary install the refrigerant service
gauges on both the high side and low side
Schräder valves to check the compressor head
and suction pressures.
NOTE. On air cooled models the condenser
temperature sensor, which is located within
the condenser fins, keep the head
(condensing) pressure between 16 and 18
bars (225-250 psig).
In the water cooled models the discharge
pressure is kept constant at the value of 17
bars(240psig)bymeansofawaterregulating
valve located on the water supply line to the
condenser.
Incaseofcondensercloggingsuchtoprevent
the proper flow of the cooling air or, in case
the fan motor is out of operation or shortage
of water in the water cooled condenser, the
condenser temperature rises and when it
reaches70 ° C(160 ° F)-foraircooledversion
-or 60 ° C(140 ° F)- for watercooled version -
the condenser temperature sensor shuts-off
theicemakerwiththeconsequentlight-upof
the RED WARNING LED (Fig.3).
Afterhavingdiagnosedthereasonoftherise
of temperature and removed its cause, it is
necessarytounplug (waitfewseconds)and
pluginagaintheunit,thustoputthemachine
in condition to initiate a new freezing cycle.
Themachinerestartswiththeusual5minutes
waterfillingphaseinordertoprovideenough
water into the sump tank.
16
15
14
13
2
1
7
8
9
10
3
4
5
6
11
12
Rx Tx
WATER IN VALVE
HOT GAS VALVE
CONTACTOR COIL
FAN MOTOR
WATER PUMP
- EVAPORATOR
- AMBIENT
- CONDENSER
TEMPERATURE SENSORSBINCOMPRESSOR
TRANSF.
DATA
PROCESSOR
ELECTR.
TIMER
DIP
SWITCH
ELECTRONIC CARD
L
N
RELAYS
RELAY
TRIAC
WATER DRAIN VALVE
FIG. 2

Page 12
Page 12
E. Check to see through the ice discharge
opening that the self propeller spray bar is
correctlyrotatingandthatthewaterjetsuniformely
reach the interior of the inverted mold cups and
there is not excessive water spilling through it.
F. Theicemakingprocesstakesplacethereby,
with the water sprayed into the molds that gets
gradually refrigerated by the heat exchange with
the refrigerant flowing into the evaporator
serpentine.
16
15
14
13
2
1
7
8
9
10
3
4
5
6
11
12
Rx Tx
WATER IN VALVE
HOT GAS VALVE
CONTACTOR COIL
FAN MOTOR
WATER PUMP
- EVAPORATOR
- AMBIENT
- CONDENSER
TEMPERATURE SENSORSBINCOMPRESSOR
TRANSF.
DATA
PROCESSOR
ELECTR.
TIMER
DIP
SWITCH
ELECTRONIC CARD
L
N
RELAYS
RELAY
TRIAC
WATER DRAIN VALVE
FIG. 4
16
15
14
13
2
1
7
8
9
10
3
4
5
6
11
12
Rx Tx
WATER IN VALVE
HOT GAS VALVE
CONTACTOR COIL
FAN MOTOR
WATER PUMP
- EVAPORATOR
- AMBIENT
- CONDENSER
TEMPERATURE SENSORSBINCOMPRESSOR
TRANSF.
DATA
PROCESSOR
ELECTR.
TIMER
DIP
SWITCH
ELECTRONIC CARD
L
N
RELAYS
RELAY
TRIAC
WATER DRAIN VALVE
FIG. 3

Page 13
Page 13
16
15
14
13
2
1
7
8
9
10
3
4
5
6
11
12
Rx Tx
WATER IN VALVE
HOT GAS VALVE
CONTACTOR COIL
FAN MOTOR
WATER PUMP
- EVAPORATOR
- AMBIENT
- CONDENSER
TEMPERATURE SENSORSBINCOMPRESSOR
TRANSF.
DATA
PROCESSOR
ELECTR.
TIMER
DIP
SWITCH
ELECTRONIC CARD
L
N
RELAYS
RELAY
TRIAC
WATER DRAIN VALVE
FIG. 5
Duringthefreezingprocess,whentheevaporator
temperature falls below an established value, to
the evaporator temperature sensor supplies a
lowvoltagepowersignaltotheelectroniccontrol
device (P.C.BOARD) in order to activate an
electronic timer.
This one takes over the control of the freezing
cycle up to the complete formation of the ice
cubes (Fig.4).
NOTE. Thelengthoftheentirefreezingcycle
is governed by the evaporator temperature
sensorwhichhasits brobe placed in contact
with the evaporator serpentine (Non
adjustable)incombinationwiththeelectronic
timer (Adjustable) incorporated in the P.C.
BOARD).
The timer adjustment is factory set in
considerationoftheicemakermodel,cooling
version and ice cube size (Small, Medium,
Large).
It is possible, however, to modify the timed
length of the freezing cycle, by changing the
DIP SWITCH keys setting.
In Table B of PRINCIPLE OF OPERATION
areshownthevarioustimeextensionsofthe
freezingcyclesecondphase,inrelationwith
the different DIP SWITCH keys settings.
G. After about 17-20 minutes from the
beginning of the freezing cycle, in an hypothetic
ambient temperature of 21°C , the defrost cycle
takes place with the hot gas and the water inlet
valves being simoultaneously activated (Fig.5).
The electrical components in operation are:
COMPRESSOR
WATER PUMP
WATER INLET SOLENOID VALVE
HOT GAS VALVE
WATER DRAIN SOLENOID VALVE/S
for the first 30 seconds.
NOTE. The length of the defrost cycle is
related to the length of the second phase of
freezing cycle T2. (Time to drop the
evaporating temperature from 0 ° C (32 ° F) -
small Red LED blinking-to-15 ° C (5 ° F) small
Red LED ON steady.
Itispossibletoextendthelengthofthedefrost
cyclebychangingthesettingofDIPSWITCH
7 and 8 as shown on table at page 24.
H. Check, during the defrost cycle, that the
incomingwaterflowscorrectlyintosumpreservoir
in order to refill it and that the surplus overflows
through the overflow drain tube.

Page 14
Page 14
16
15
14
13
2
1
7
8
9
10
3
4
5
6
11
12
Rx Tx
WATER IN VALVE
HOT GAS VALVE
CONTACTOR COIL
FAN MOTOR
WATER PUMP
- EVAPORATOR
- AMBIENT
- CONDENSER
TEMPERATURE SENSORSBINCOMPRESSOR
TRANSF.
DATA
PROCESSOR
ELECTR.
TIMER
DIP
SWITCH
ELECTRONIC CARD
L
N
RELAYS
RELAY
TRIAC
WATER DRAIN VALVE
FIG. 6
I. Checkthetextureoficecubesjustreleased.
They have to be in the right shape with a small
depression of about 5-6 mm in their crown.
Ifnot,waitforthecompletion ofthesecondcycle
before performing any adjustment.
If required, the length of the timed freezing cycle
can be modified by changing the DIP SWITCH
keys setting as illustrated in OPERATING
PRINCIPLE.
If the ice cubes are shallow and cloudy, it is
possible that the ice maker runs short of water
during the freezing cycle second phase or, the
quality of the supplied water requires the use of
an appropriate water filter or conditioner.
J. To be sure of the correct operation of ice
level control device, place one hand between its
sensing “eyes” to interrupt the light beam.
The Bin Full YELLOW LED starts to blink, and
after 60 seconds, the unit stops with the
simultaneousglowingofthesame LED tomoni-
tor the BIN FULL situation (Fig.6).
Take the hand out from the ice level control
sensors to allow the resumption of the light
beam. The BIN FULL YELLOW LED blinks fast
andafterapproximately6secondstheicemaker
resumeitsoperation withtheimmediateglowing
of the FIRST YELLOW LED indicating UNIT IN
OPERATION and the extinguishing of the “BIN
FULL” YELLOW LED.
NOTE. The ICE LEVEL CONTROL
(INFRAREDSYSTEM)isindependentofthe
temperature however, the reliability of its
detection can be affected by external light
radiations or by any sort of dirt and scale
sediment which may deposit directly on the
light source and on the receiver.To prevent
any possible ice maker malfunction, due to
negative affection of the light detector, it is
advisable to locate the unit where it is not
reached by any direct light beam or light
radiation,alsoitisrecommendedtokeepthe
bin door constantly closed and to follow the
instructions for the periodical cleaning of
thelightsensorelementsasdetailedinthe
MAINTENANCE AND CLEANING PRO-
CEDURES.
Attimeofinstallationit'snecessarytoperform
the calibration of the I/R Ice Level control.
• Switch OFF the machine at Master Green
Push Button Switch
• Push and hold the PC Board Push Button
• Switch ON the machine at Master Green
Push Button Switch
• Few seconds later the LEDs of the PC
Board starts to blink
• Release the PC Board Push Button
The I/R Ice Level control is now calibrated.
K. Remove, if previously installed, the
refrigerant service gauges and re-fit the unit
service panels previously removed.
L. Instruct the owner/user on the general
operation of the ice machine and about the
cleaning and care it requires.

Page 15
Page 15
PRINCIPLE OF OPERATION
How it works
In the SCOTSMAN Modular Cubers the water
used to make the ice is kept constantly in
circulationbyanelectricwaterpumpwhichprimes
it to the self propeller spray bar nozzles from
whereitisdivertedintotheinvertedmoldcupsof
the evaporator (Fig. B).
Asmallquantityofthesprayedwaterfreezesinto
ice; the rest of it cascades by gravity into the
sump assembly below for recirculation.
FREEZING CYCLE (Fig. A)
The hot gas refrigerant discharged out from the
compressorreachesthecondenserwhere,being
cooleddown,condensesintoliquid.Flowinginto
the liquid line it passes through the drier filter,
thenitgoesallthewaythroughthecapillarytube
where, due to the heat exchanging action, it
loosessomeofitsheatcontentsothatitspressure
and temperature are lowered as well.
Next the refrigerant enters into the evaporator
serpentine (which has a larger I.D. then the
capillary) and starts to boil off; this reaction is
emphasized by the heat transferred by the
sprayed water.
The refrigerant then increases in volume and
changes entirely into vapor.
The vapor refrigerant then passes through the
suction accumulator (used to prevent that any
small amount of liquid refrigerant may reach the
compressor)andthroughthesuctionline.Inboth
theaccumulatorandthesuctionlineitexchanges
heatwiththerefrigerant flowing intothecapillary
tube (warmer), before to be sucked in the
compressor and to be recirculated as hot
compressed refrigerant gas.
Thefreezingcycleiscontrolledbytheevaporator
temperaturesensor(whichhasitsprobeincontact
with the evaporator serpentine) that determines
the length of its first portion of the cycle.
When the temperature of the evaporator
serpentinedropstoapre-setvalue,theevaporator
sensor probe changes its electrical resistance
allowingalowvoltagecurrent(12volts)toflowto
the P.C. BOARD which in turn activates an
electronic timer.
The timer, which is built-in the P.C. BOARD,
takes over from the evaporator temperature
sensor, the control of the freezing cycle up to its
completion.
NOTE. Thechangeoftheelectricpotentialof
the evaporator sensor with the consequent
activationofthetimer(Timemode)issignalled
by the glowing-up of the RED LED located
besidetheFREEZINGyellowoneinthefront
of the P.C. BOARD.
ATTENTION. In case, after 15 minutes
from the beginning of the freezing cycle,
thetemperatureofthe evaporator sensor
probe is higher then 0°C (32°F) (shortage
of refrigerant, inoperative hot gas valve,
etc.) the P.C. BOARD switch OFF
immediately the unit with the
simultaneous blinking of the WARNING
RED LED.
The length of this second portion of the freezing
cycle ispre-fixedandrelatedtothesettingofthe
first four DIP SWITCH keys.
The DIP SWITCH keys setting is made in
consideration of the type of condenser used.
InTableBareindicatedthevariouslengthsofthe
second portion of freezing cycle (Time mode) in
relation to the different combinations of the DIP
SWITCH KEYS.
In Table A herebelow are illustrated the DIP
SWITCHkeycombinationsforthethreedifferent
factory.

Page 16
Page 16

Page 17
Page 17
The electrical components in operation during
the freezing cycle are:
COMPRESSOR
FAN MOTOR (in air cooled version)
WATER PUMP
CONTACTOR COIL
and during the second phase of freezing cycle
(Time mode) they are joined by the
ELECTRONIC TIMER
The refrigerant head pressure, in the course of
the freezing cycle, ranges between 18 and 16
bars (250-225 psig) being controlled by the tem-
perature sensor probe located within the
condenser fins (air cooled version) or, on the
condenser tube coil (water cooled version).
Ontheaircooledversion,thecondenser tempe-
rature sensor, when senses a rising of the
condenser temperature beyond the pre-fixed
limit,changesitselectricalresistanceandsenda
lowvoltagepowerflowtotheMicroProcessorof
P.C. BOARD which in turn energizes, through a
TRIAC, the FAN MOTOR.
When the opposite situation occures, i.e. the
condensertemperaturegetsbelowthepre-fixed
limit, the temperature sensor changes again its
electricalresistancereducingthereforethecurrent
flow to the P.C. BOARD to cause the fan motor
temporary cut-off.
NOTE.Onthismodelthecondensersensors
areusedjusttoswitchofftheunitincasethe
condensingtemperatureriseuptomorethen
70 ° C (for air cooled version) or more then
62 ° C(forwatercooledversion)foroneofthe
following abnormal reasons:
CLOGGED CONDENSER (Air cooled
version)
FAN MOTOR OUT OF OPERATION (Air
cooled version)
INSUFFICIENT FLOW OF COOLING
WATER (Water cooled version)
AMBIENTTEMPERATUREHIGHERTHEN
40 ° C (100 ° F)
itcausesthetotalandimmediateSHUT-OFF
of the machine in order to prevent the unit
from operating in abnormal and dangerous
conditions.
When the ice maker stops on account of this
protective device, there is a simultaneous
glowingoftheREDLED,warningtheuserof
the Hi Temperature situation.
After having efiminated the source of the
condenser hi-temperature, to restart the
machine justswitchingOFFandONtheunit
at main line switch.
Theicemachineresumesitsnormaloperation
by going through the 5 minutes water filling
phase.
At the start of the freezing cycle the refrigerant
suctionorlo-pressurelowersrapidlyto2.5bars-
35psigthenitdeclinesgradually-inrelationwith
thegrowingof theicethickness-to reach,atthe
end of the cycle, approx. 1.6 ÷1.7 bar - 22 ÷24
psigwiththecubesfullyformedinthecupmolds.
Thetotallengthofthefreezingcyclerangesfrom
20 to 25 minutes.
DEFROST OR HARVEST CYCLE (Fig. D)
As the electronic timer has carried the system
throughout the second phase of freezing cycle,
the defrost cycle starts.
ATTENTION. In case the unit be able to
reach 0°C (32°F) evaporating temperatu-
re within 15 minutes, but after 45 minutes
fromthe beginningofthefreezingcycleit
has not yet reached the evaporator tem-
perature of -15°C (5°F) the machine goes
straight into the defrost cycle omitting
the timed portion of the freezing cycle
relied to the setting of the first four DIP
SWITCHES.
NOTE. The length of the defrost cycle is
related to the length of the second phase of
freezing cycle T2. (Time to drop the
evaporating temperature from 0 ° C (32 ° F) -
small Red LED blinking-to-15 ° C (5 ° F) small
Red LED ON steady.
Itispossibletoextendthelengthofthedefrost
cyclebychangingthesettingofDIPSWITCH
7 and 8 as shown on table at page 24.
The electrical components in operation during
this phase are:
COMPRESSOR
CONTACTOR COIL
WATER INLET VALVE
HOT GAS VALVE
WATER DRAIN VALVE
and the
WATER PUMP
on the first 30 seconds.
The incoming water, passing through the water
inlet valve and the flow control, runs over the
evaporator platen and then flows by gravity
through the dribbler holes down into the sump/
reservoir (Fig. D).
Thewaterfillingthesump/reservoirforcespartof
the surplus water from the previous freezing
cycleto go out to the waste throughtheoverflow
pipe. This overflow limits the level of the sump
water which will be used to produce the next
batch of ice cubes.

Page 18
Page 18
Meanwhile,therefrigerantashot gas,discharged
from the compressor, flows through the hot gas
valve directly into the evaporator serpentine by-
passing the condenser.
Thehotgascirculatingintotheserpentineofthe
evaporator warms up the copper molds causing
the defrost of the ice cubes. The ice cubes,
released from the cups, drop by gravity onto a
slanted cube chute, then through a curtained
opening they fall into the storage bin.
At the end of the defrost cycle, both the hot gas
andthewaterinletvalvescloseandthemachine
starts again a new freezing cycle.
OPERATION - CONTROL SEQUENCE
At the start of freezing cycle, the evaporator
temperature sensor controls the length of the
first part of the freezing cycle. As it reaches a
predetermined temperature, it supplies a low
voltage current to the P.C. BOARD in order to
activate the electronic timer which, takes over
the control of the freezing cycle for a pre-fixed
time,accordingtotheDIPSWITCHkeys setting
(see Tab. B).
NOTE.Theevaporatortemperaturesensor,
factorypre-set,isthesameforallthemodels
and is not adjustable.
Once completed the freezing cycle 2nd phase
the system goes automatically into the defrost
cycle which also has a pre-fixed length. At
completionofthe defrost cycle the P.C. BOARD
commandsthe unit to start again anew freezing
cycle.
OPERATION - ELECTRICAL SEQUENCE
The following charts illustrate which switches
and which components are ON or OFF during a
partÌcular phase of the icemaking cycle.
BEGINNIING FREEZE
Electrical components (Loads). ON OFF
Compressor.................................. •
Fan Motor (Air cooled only) and TRIAC •
Hot Gas Valve .............................. •
Inlet Water Valve.......................... •
P.C. Board Relay 1 Coil ............... •
P.C. Board Relay 2 & 3 Coil......... •
Water Pump ................................. •
Contactor Coil .............................. •
Electronic Timer ........................... •
Electronic Controls & Sensors .. ON OFF
Evaporator Sensor ....................... •
Condenser Sensor ....................... •
Ice Level Control .......................... •
TIMED FREEZE
Electrical components (Loads). ON OFF
Compressor.................................. •
Fan Motor (Air cooled only) and TRIAC ••
Hot Gas Valve .............................. •
Inlet Water Valve.......................... •
P.C. Board Relay 1 Coil ............... •
P.C. Board Relay 2 & 3 Coil......... •
Water Pump ................................. •
Contactor Coil .............................. •
Electronic Timer ........................... •
Electronic Controls & Sensors . ON OFF
Evaporator Sensor ....................... •
Condenser Sensor ....................... • •
Ice Level Control .......................... •
HARVEST (Drain portion - first 30 sec.)
Electrical components (Loads). ON OFF
Compressor.................................. •
Fan Motor (Air cooled only) and TRIAC . •
Hot Gas Valve .............................. •
Water Inlet Valve.......................... •
Water Drain Valve ........................ •
P.C. Board Relay 1 & 2 Coil......... •
P.C. Board Relay 3 Coil ............... •
Water Pump ................................. •
Contactor Coil .............................. •
P.C.B. Timer................................. •
HARVEST (Water filling portion)
Electrical components (Loads). ON OFF
Compressor.................................. •
Fan Motor (Air cooled only) and TRIAC . •
Hot Gas Valve .............................. •
Water Inlet Valve.......................... •
Water Drain Valve ........................ •
P.C. Board Relay 1 & 2 Coil......... •
P.C. Board Relay 3 Coil ............... •
Water Pump ................................. •
Contactor Coil .............................. •
P.C. Board Timer ......................... •
Electronic Controls & Sensors . ON OFF
Evaporator Sensor ....................... •
Condenser Sensor ....................... •
Ice Level Control .......................... •

Page 19
Page 19
Freeze Cycle
Average Discharge
Pressure A/C: 16÷18 bars (225÷250 psig)
Average Discharge
Pressure W/C: 17 bars (240 psig)
Suction Pressure End
Freeze Cycle: 1.6÷1.7 bar (22÷24 psig)
REFRIGERANT CHARGE (R 404 A)
Air Cooled Water Cooled
MC 46 1300 gr 700 gr
MC 46 (60 Hz) 1040 gr 560 gr
NOTE.Beforechargingtherefrigerantsystem
always check the type of refrigerant and
quantity as specified on the individual ice
machine dataplate.
Therefrigerantchargesindicatedarerelated
to average operating conditions.
WARNING.AsR404aisabandofdifferent
types of refrigerants it is imperative to
charge the system only in liquid phase in
order to avoid to alter their mix-up
percentage.
COMPONENTS DESCRIPTION
A. EVAPORATOR TEMPERATURE
SENSOR
The evaporator temperature sensor probe,
locatedincontactwiththeevaporatorserpentine,
detects the dropping of the evaporator tempera-
ture during the freezing cycle and signals it by
supplyingacurrentflowtothemicroprocessorof
P.C. BOARD.
Accordingtothecurrent received,theevaporator
sensor supplies power to the P.C. BOARD first,
when it reachs 0 ° C (32 ° F), second at -15 ° C (5 ° F);
inthissecondcaseitsupplypowertotheelectronic
timer built into the P.C. BOARD so that it may
take control of the fength of the 2nd phase of
freezing cycle.
Thelengthof thetimedphaseispre-fixedbythe
setting of the keys 1, 2, 3 and 4 of the DIP
SWITCH.
The activation of the electronic timer (-15°C -
5°F) is monitored by the lighting up of the RED
LED placed in the front of the P.C. BOARD.
Thislightingupoccuresusuallyinthemidperiod
of the freezing cycle and signals the switching
fromthe first to the second phase ofthefreezing
cycle.
NOTE.Whenever,after15minutesfrom the
beginning of the freezing cycle, the
evaporating temperature have not yet
reached the value of 0 ° C (32 ° F), the P.C.
BOARD switches OFF the machine with the
BLINKING of RED LED.
B. CONDENSERTEMPERATURESENSOR
The condenser temperature sensor probe,
located within the condenser fins (air cooled
version) or in contact with the tube coil (water
cooledversion) detects the condenser tempera-
ture variations and signals them by supplying
current, at low voltage, to the P.C. BOARD.
In the air cooled versions, in relation to the
differentcurrentreceived,themicroprocessorof
theP.C.BOARDsupplies, through aTRIAC,the
power at high voltage to the fan motor so to cool
the condenser and to reduce its temperature.
In case the condenser temperature rises and
reaches70°C(160°F)-onaircooledmodels-or
62°C (145°F) - on water cooled models - the
current arriving to the micro processor is such to
causeanimmediateandtotalstopofthemachine
operation.
C. ICE BIN LEVEL LIGHT CONTROL
The electronic ice bin level control, located
into the storage bin, has the function to stop
the operation of the ice machine ONLY AT
THE END OF THE HARVEST CYCLE when
the light beam between the light source and
the sensor is interrupted by the ice cubes
stored into the bin.
When the light beam is interrupted the Bin Full
YELLOW LED starts blinking .
SETTING OF THE ICE LEVEL
CONTROL SENSIVITY
Incaseofanyneedit'spossibletouptodatethe
sensivity of the optical ice level control as per
here below procedure:
a) SwitchOFFthemachineatPowerMainSwitch
b)PushandholdthePCBoardPushButton
c) Switch ON the machine at Power Main Switch
d)KeeppushedthePCBoardPushButton
till the Leds of the PC Board are ON
e) Release the PC Board Push Button.
NOTE. The setting of the Ice Level Control
Sensivity must be done any time a new PC
Board or a new lce Level Control is installed
in the machine.